Brief synthesisThe Slate Landscape of Northwest Wales is located in the United Kingdom, in the mountains of Snowdon massif. Criterion (ii): The Slate Landscape of Northwest Wales exhibits an important interchange, particularly in the period from 1780 to 1940, on developments in architecture and technology. Criterion (iv): The Slate Landscape of Northwest Wales is an outstanding example of a stone quarrying and mining landscape which illustrates the extent of transformation of an agricultural environment during the Industrial Revolution. Attributes of Outstanding Universal Value have been defined and articulated in The Slate Landscape of Northwest Wales Property Management Plan which establishes the over-arching strategies and mechanisms by which the serial property will be managed. There is no active quarrying or mining within the serial property; mineral activity takes place in the wider protected area outside the boundaries of the serial property.